a. The sample mean and standard deviation from a random sample of 10 observations from a normal population were computed as x = 23 and s = 9. Calculate the value of the test statistic (and for Excel...

a. The sample mean and standard deviation from a random sample of 10 observations from a normal population were computed as x = 23 and s = 9. Calculate the value of the test statistic (and for Excel users, the p-value) of the test required to determine whether there is enough evidence to infer at the 5% significance level that the population mean is greater than 20. b. Repeat part (a) with n = 30. c. Repeat part (a) with n = 50. d. Describe the effect on the t-statistic (and for Excel users, the p-value) of increasing the sample size.